Check valve



'my 12' 1927 J. HlRsHsTElN CHECK VALVE Filed Sept. 20. 1924 attorney Patented July 12, 1927.

i narran srarnsi 1,635,842 PAT erste JOSEPH mnsnsfrnimjon CLEVELANDHEIGHTS, omo.

CHECK VALVE;

Application ilediseptember 20,1924., Serial -No 7 3&',838-.`

when only a minimum pressure prevails due to the convective-action ot thewater7` but which willy become accurately seatedI when the pressure in the vsystem on both sides oit the valve becomes materially unbalancedl in an opposite direction. Y

@ther objects otmy invention will hereinafter be set forth in the following speci'- i'icatien referring to the accompanying drawings illustrating the preferred form thereof.l The essentiall characteristics are summarized in the claims.

l'nthe. drawings, Fig. 1 is across sectional view taken througl'i the valve bodyl when the check member is normally in unseated position; F ig. 2 is al similar cross sectional view showing the- .position of the check member when anunusual circulatory move ment ofthe water is taking plfaeeinthe sys tem in which it installed; Fig. 3 is an enlarged sectional view of the check member and a supporting bearing member therefor; Fig. tis a yside elevational view oifthebearing member and the check member; Fig. 5 is a fragmentary perspective view ol a-beari1r1g lug formed on the body member of the valve. y

My invention contemplates a valve construction for Checkingv the flo'wfo'l water in a system in one direction while permitting vthe flow of water in the opposite direction, without necessitating an actuation of the flapper member to open 'the valve; the cheek member being suspended in a normally unseated position. The bearing for the check member is in the nature of a double pivot"l suspension, whereby the check memberl will readily respond to any flow of the water in the system in which the valve member is installed under an extremely low piessure.

As shown in the drawings, I provide the usual valve body member 1() with an interiorly disposed annular Seat portion l1 which` isr concentric with threaded branch portions 12 and.; 13. A., branch portionv let 1s provided topermit access to the interior of the valve body; when. once installed and 60 this branchportionis closed byv a threaded capimember 15 which lalso serves to retain suspensionmeansfor theV check member in @peta-tive; positionas will be hereinafter set forth. Y Y

'lfhe-valxf'echeek member. may comprise a disc 18g-which is supported on a swingable arm 19g-andV may bey provided with a; stud portioni-QO` loosely fitting inasuitable bore 'formed in the lowei1i endl ofY the armv` 19,

wherebyth'edise lfisV treeto rotate relatit-ve to the valve bedyseat 11. The check disc may be maintained in proper.- relation to `the arm- 191 by any suitable means sueh asa nut 22 bearingon a suitable shoulder Yformed onithe studzportion ofthe disc.

To, attend' a very sensitive suspensienifor the4 arni 151 wherebythe disc member may respond' to` any slight. convective movement otithewater in the system, l'provide a bearing memberrl@ compris-ing essentially an lippen fulcrum bar Qfand ashorter lower lulcruln bar 26.'. Tfhe fulcrum bars have the opposed bearing edges thereof shaped to form a line contact.` The valveV body` 10 is provided with hollow bearing lugsA 28 whichare shaped to support the ends Vof the tulcrum bar 25, and the .location oi' the. lugs issuchll that the disc 18' will besuspe'nded inY a normally unseated position wherebyy the valveis nermallyfopen. These lugs are also in such.` position` that the tops thereof' may be` adjacent the Linner edge of the closure cap ufherebythe cap willmaintainthe bearing member in operativeposition. The upper endlofthe arm E19 is biturcated as shown iirFig.A 'whereby-the fulcrum bar Qt'may bea-rin a' bore formedinthe biturcated. portion of the arm. The bearing 24 is pre-fL erably forn'iedtoxcomprise aI casting with theulcrumbars-formed integrally therewith and lfaccordingly' provide slots 30 in the arm-19 as show-n in Fig. t-whereby the bar 36 may be :readily positioned in the bored openingsvformed in the biturcated pertionsfoffthe arm. The posi-tion otthese slots relative to the seating position of the disc 18 is such as to extend toward the valve seat of the body, whereby when the valve check 18 is swung to a full open position as shown in Fig. 2, the fulcrum edges of the bar 26, the possibility of the arin 19 becoming operatively displaced relative to the bearing member 24k is eliminated.

To decrease the length of the radial swing ot the disc 18, the movement of the bearing member 24 is limited so that major portion of the arm swing is about the fulcrum barl 26, whence the amount of clearance therefor, and incidently the size of the body may be decreased, I provide a stop lug 34 on the member 24 which is adapted to contact with a suitably positioned lug 35 extending from the wall ot the branch 14 to limit the movement of the fulcrum member 24.

From the foregoing description of my invention, it will be seen that I have Provided a check valve construction of the tlapper type wherein the check member is afforded a double pivotal suspension, maintaining the check member normally in an unseated position whereby a slow movement of the water through the check valve may take place without necessitating unseating of the valve. The parts may be readily assembled for purposes of cleaning Without necessitating removal of pins or screws. The bearing construction is such that the swinging movement of the means supporting the check member tends to maintain the bearing surfaces in a clean condition regardless of the accumulation of sludge and other foreign matter on the bearing surfaces for movable parts of the valve. Furthermore, even though the valve parts may be readily taken apart manually, without necessitating the use of tools, the arrangement is such that movable members of the valve mechanism may all be maintained in a cooperative relation with the possibility of becoming displaced eliminated.

I-Iaving thus described my invention, I claim:

l. In a check valve, the combination of a valve body .having opposed threaded ends and a concentric valve seat, a closed branch, a cap closing the branch, a valve check member, an arm swingably mounted Within the branch and pivotally supporting the valve check member, a ulcrum bearing member mounted in the throat of the branch and aiiiordinga double pivotal suspension for the arm and suspending thc Valve closure member in relation to the valve body seat, an extension `formed on the ulcrum member and a projection onthe throat of the branch adapted to cooperate with said extension thereby limiting the swingable movement of the tulcrum member thereof in the direction of open position.

Q. In a check valve of the character described, the combination of a valve body having a. seat formed concentrically of closed threaded ends oi' the valve body, a valve check member, an arm supporting the check member. a double bearing fulcrum member suspended in the throat of a branch oit the valve body, the arm having a bifurcated upper end, said bifurcated end being slotted in a direction to extend toward the seat of the valve body for permitting the assembly of the fulcrum member and the arm.

3. In combination, a valve body having a valve seat, a branch, a valve check member, said branch having bearing lugs extending from the throat thereof, an arm swingably mounted within the branch supporting the valve check member. a 'fulcrum bearing member mounted in said lugs and atfording a double pivota'l suspension for the arm and suspending the valve closure member, an extension formed on the fulcrum member and a projection on the throat of the branch adapted to cooperate with saidA extension thereby limiting the movement of said fulcrum bearing member.

4. In a check valve the combination of a valve body having opposed threaded ends and a concentric valve seat, a closed branch, a cap c'losing the branch, upwardly facing lugs extending inwardly within the throat of said branch and being positioned adjacent said cap, a bearing member adapted to be carried by said lugs and retained in said lugs by said cap, an extension formed on the bearing member and a projection on the throat of the branch adapted to cooperate with said extension thereby limiting the movement of said bearing member, a valve check member and means for loosely sus- )ending said valve check member from said caring member.

5. In combination, a valve body having a valve seat, a branch, a valve closure member, said branch having bearing portions extending from the throat thereof, an arm swingably mounted within the branch supporting the valve closure member, a iulcrum bearing member supported in said bearing portions and affording a double pivotal suspension ior the arm and suspending the valve closure member, an extension formed on the tulorum member and adapted to cooperate with a lined portion oit the throat oi the branch, thereby limiting the movement of said fulcrum bearing member.

In testimony whereof, l hereunto aflix my signature.

J OSEPH HIRSHSTEIN. 

